Quilter's Cache has a good method too. Her patterns list the geese and square in a square blocks just using squares or rectangles and squares.
I start with a rectangle and put squares on the two sides. I sew corner to corner and a scant 1/2" away I sew again. I cut between the seams and I have one flying geese unit and 2 Half Square Triangle blocks to be used in a scrap quilt somewhere. That way, it wastes no fabric and I don't have scary biases everywhere.
A girlfriend who makes some of the most intricate pieced tops uses the original link with 5 squares and you end up with 4 geese units. She loves that way. I personally haven't tried it yet, but I've not seen the link with instructions either. I sure saved it.